main: Add U-Boot bootlader backend support

This patch adds support to generate files that
can be used by Universal Bootloader (U-Boot).

U-Boot allows to modify boards default boot commands by
reading and executing a bootscript file or importing a
plain text file that contains environment variables that
could parameterize the boot command or a bootscript.

OSTree generates a uEnv.txt file that contains booting
information that is taken from Boot Loader Specification
snippets files as defined in the new OSTree deployment model:

https://wiki.gnome.org/OSTree/DeploymentModel2

On deploy or upgrade an uEnv.txt env var file is created
in the path /boot/loader.${bootversion}/uEnv.txt. Also, a
/boot/uEnv.txt symbolic link to loader/uEnv.txt is created
so U-Boot can always import the file from a fixed path.

Since U-Boot does not support a menu to list a set of
Operative Systems, the most recent bootloader configuration
from the list is used.

To boot an OSTree using the generated uEnv.txt file, a
board has to parameterize its default boot command using the
following variables defined by OSTree:

${kernel_image}:  path to the Linux kernel image
${ramdisk_image}: path to the initial ramdisk image
${bootargs}:      parameters passed to the kernel command line

Alternatively, for boards that don't support this scheme,
a bootscript that overrides the default boot command can be used.

An example of such a bootscript could be:

setenv scriptaddr 40008000
setenv kernel_addr 0x40007000
setenv ramdisk_addr 0x42000000
ext2load mmc 0:1 ${scriptaddr} uEnv.txt
env import -t ${scriptaddr} ${filesize}
ext2load mmc 0:1 ${kernel_addr} ${kernel_image}
ext2load mmc 0:1 ${ramdisk_addr} ${ramdisk_image}
bootm ${kernel_addr} ${ramdisk_addr}

Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>

https://bugzilla.gnome.org/show_bug.cgi?id=706370

1 files changed, 6 insertions, 0 deletions

diff --git a/src/ostree/ot-admin-functions.c b/src/ostree/ot-admin-functions.c
index b2caa4c4..7dfc30f1 100644
--- a/src/ostree/ot-admin-functions.c
+++ b/src/ostree/ot-admin-functions.c
@@ -26,6 +26,7 @@
 #include "ot-deployment.h"
 #include "ot-config-parser.h"
 #include "ot-bootloader-syslinux.h"
+#include "ot-bootloader-uboot.h"
 #include "otutil.h"
 #include "ostree.h"
 #include "libgsystem.h"
@@ -794,11 +795,16 @@ OtBootloader *
 ot_admin_query_bootloader (GFile         *sysroot)
 {
   OtBootloaderSyslinux *syslinux;
+  OtBootloaderUboot    *uboot;
 
   syslinux = ot_bootloader_syslinux_new (sysroot);
   if (ot_bootloader_query ((OtBootloader*)syslinux))
     return (OtBootloader*) (syslinux);
 
+  uboot = ot_bootloader_uboot_new (sysroot);
+  if (ot_bootloader_query ((OtBootloader*)uboot))
+    return (OtBootloader*) (uboot);
+
   return NULL;
 }